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Regular Perennial Cool-Season grasses should not be subject to winterkill even if newly germinated... What does happenis that when the snow is gone and the days warm up and the nites continue to freeze the 'green leaves' do dry up and turn brown...
That is true of even the mature grasses... the baby grasses should survive the same way, if they've already germinated... as long as there is still adequate moisture in the frozen soil as it thaws...
That, however is ONLY my belief and can not say for sure that baby grasses germinated in early Winter will survive to the end of Spring...
One thing I have noticed when germinating seed in my garden years back was that when the grass was 1" tall, the root I pulled up was about 4" long...
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Water/air ratio in relation to water flow to/from any plantlife is a Basic Fundamental Concept in understanding seed germination as much as transplanting a 20' Maple tree in 90 degree weather...
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